Bug 1322993 - Guard against deleting nonexistent directory during emulator cleanup; r=whimboo

MozReview-Commit-ID: 7hopCdbHhj1

--HG--
extra : rebase_source : 64fcb946246aa89a00d2039f3cfbf6cdf24c62fc

testing/mozbase/mozrunner/mozrunner/devices/emulator.py

@@ -165,7 +165,8 @@ class BaseEmulator(Device):
             self.connected = False
 
         # Remove temporary files
-        shutil.rmtree(self.tmpdir)
+        if os.path.isdir(self.tempdir):
+            shutil.rmtree(self.tmpdir)
 
     def _get_telnet_response(self, command=None):
         output = []